Plants of
South Australia
Alectryon oleifolius ssp. canescens
Sapindaceae
Cattle Bush
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Regional Species Conservation Assessments per IBRA subregion.
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Etymology

Alectryon from the Greek words 'alectryon' meaning rooster; possibly referring to the red aril on the seed being similar to a rooster's comb. Oleifolius for olive leaved. Canescens from the Latin 'canescens' becoming hoary, referring to the grey colour of the olive-like leaves.

Distribution and status

Widespread across South Australia except for Kangaroo Island and South-east regions. Common in arid and semi-arid areas on sandy soils, usually in open woodland or shrubland. Also found in Western Australia, Queensland, New South Wales and Victoria. Native. Common in South Australia. Common in other states.
Herbarium regions: North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty
NRM regions: Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)

Plant description

Small tree to 9m, branches and leaves usually pendant. Leaves simple, linear to narrow-elliptic or narrow-obovate to 15cm long and 2cm wide; green to grey-green. Inflorescences to 9cm long. Calyx irregularly toothed, bright green; petals absent. Flowering between September and November. Fruits are brown thin woody capsule to 8mm long and 15mm wide, usually 2-lobed. Seeds are hard, black, globular seed to 4mm long and 4mm wide with a large red aril. Seed embryo type is bent

Seed collection and propagation

Collect seeds between February and April. Collect mature fruits that have split with large red arils emerging and shiny black seeds. Seeds can also be collected from the ground. Place fruits in a tray or paper bag and the fruit will open and the seed will fall out. Use a sieve to separate the unwanted the material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. From one collection seed viability was high (92%). Seeds that are collected before the fruits split are likely to be immature and non-viable. The highly coloured, oily arils are likely to be removed by birds or other seed dispersers. Removing the aril significantly increased germination in a nursery experiment. In laboratory experiments, seeds with arils removed had higher germination levels in spring/autumn conditions than in winter conditions. Members of the plant family Spanidaceae may have physical dormancy imposed by the seed coat and require nicking or hot water treatment before germination will occur. Alectryon oleifolius seeds did not require nicking or hot water treatment. They have a small micropylar opening, observed when the aril is removed, which may allow the passage of water through the seed coat (see photo above). Germination research for this species was supported by SAMDB NRM.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
1,625 (65 g)
1,625 (65 g)
506-Mar-2006DJD420
Yorke Peninsula
8-Aug-200630%-18°C
BGA1,000 (145 g)21-Mar-2017JRG566
Murray
1-Nov-201792%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.
Germination table:
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